Question about measurement conversions

Hi,

I have sorted some vignettes into folders in Plankton Identifier. Im not sure where to go from here. In data analysis do I simply extract the data to a text file and use these values I attain?
I would like to compare length measurements made from the microscope with those that are calculated with the zooscan.
Where can I get this measurement?
Do I have to convert my length measurement to a sphere in order to compare the microscope value to a value attained with plankton identifier?
For example if I have measured a chaetognath as being 22 mm under the microscope how do I compare this measurement with values from plankton identifier/zooscan?
Regards
Michelle

Dear Michele,
Happy to welcome you in the Zooscan Forum !

I have sorted some vignettes into folders in Plankton Identifier. Im not sure where to go from here. In data analysis do I simply extract the data to a text file and use these values I attain?

If you do a prediction using the Data Analysis tool, you get a resulting file containing the data for all the selected pid files and the prediction column. See PKId manual for that. You can also enable to get also individual pid.txt files for each of them.
You can use these files at you convenience and use them to "Extract vignettes according to prediction" in Zooprocess and manually check your prediction on the vignettes. You can use then the "Load identification from sorted vignettes" tool to load the new Id of the organisms and make stats (Excel, Matlab...) to compare prediction/verification on these extracted vignettes.

I would like to compare length measurements made from the microscope with those that are calculated with the zooscan.

The "Major" axes fits well with the copepod length.

Where can I get this measurement?

Pid files ! and also the *.meas.txt files.

Do I have to convert my length measurement to a sphere in order to compare the microscope value to a value attained with plankton identifier?
For example if I have measured a chaetognath as being 22 mm under the microscope how do I compare this measurement with values from plankton identifier/zooscan?

No !
This question is not easy. If your organism is a copepod, it works well with "Major", if it is an Egg, use Area to process ESDiametre... For other organisms, It is much difficult. For Chaetognath, you can say that the length/width ratio is constant and thus derive the curved length from the Area. There is still a lot to do on this question.
Best regards
Marc P.